item_db: lower sell prices of lazurite{shard,crystal} and heart of lazurite to reasonable amounts
Dark Magic:

	* Adding Dark Magic Skill.
	* Adding spells made by MisterGrey.
	* Balancing MrGrey's spells.
	* Adding an AoE spell.
	* nerfed light magic for Dark Mages.
	* Dark Magic spells are queststate dependend.
Dark Magic - Quests:

	* Adjusting Debug-NPC.
	* added Quests for 3 Spells, QuestStates are documented in the NPC script.
	* proofread by melkior.